NAME

TESTING/LIN/dget01.f

SYNOPSIS

Functions/Subroutines

subroutine dget01 (m, n, a, lda, afac, ldafac, ipiv, rwork, resid)
DGET01

Function/Subroutine Documentation

subroutine dget01 (integer m, integer n, double precision, dimension( lda, * ) a, integer lda, double precision, dimension( ldafac, * ) afac, integer ldafac, integer, dimension( * ) ipiv, double precision, dimension( * ) rwork, double precision resid)

DGET01

Purpose:



 DGET01 reconstructs a matrix A from its L*U factorization and


 computes the residual


    norm(L*U - A) / ( N * norm(A) * EPS ),


 where EPS is the machine epsilon.

Parameters



          M is INTEGER


          The number of rows of the matrix A.  M >= 0.



          N is INTEGER


          The number of columns of the matrix A.  N >= 0.



          A is DOUBLE PRECISION array, dimension (LDA,N)


          The original M x N matrix A.

LDA



          LDA is INTEGER


          The leading dimension of the array A.  LDA >= max(1,M).

AFAC



          AFAC is DOUBLE PRECISION array, dimension (LDAFAC,N)


          The factored form of the matrix A.  AFAC contains the factors


          L and U from the L*U factorization as computed by DGETRF.


          Overwritten with the reconstructed matrix, and then with the


          difference L*U - A.

LDAFAC



          LDAFAC is INTEGER


          The leading dimension of the array AFAC.  LDAFAC >= max(1,M).

IPIV



          IPIV is INTEGER array, dimension (N)


          The pivot indices from DGETRF.

RWORK



          RWORK is DOUBLE PRECISION array, dimension (M)

RESID



          RESID is DOUBLE PRECISION


          norm(L*U - A) / ( N * norm(A) * EPS )

Author

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Definition at line 105 of file dget01.f.

Author

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